Myron L 729II - Manual (Page 61)

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IX. GLOSSARY
442™ An Internationally recognized “natural water” standard developed by the Myron L Company in 1964.
Algorithm A procedure for solving a mathematical problem. See Addendum, Temperature Compensation and TDS
Derivation.
Anions Negatively charged ions
DVM Digital Volt Meter
Hysteresis Dead Band — related to alarm setpoint. The amount of delay or overlap between change from high to low or low
to high.
LCD Liquid Crystal Display
Logarithm An arithmetic function. See Addendum, pH Units.
KCl Potassium Chloride — used as a standard for many applications. Normally, micromhos or microsiemens are the
units of measure.
NaCl Sodium Chloride — used as a standard for sea water and other applications.
NIST National Institute Standards & Testing
ORP Oxidation-Reduction Potential or REDOX, See Addendum, ORP/Oxidation-Reduction Potential/REDOX.
pH Acid or Alkaline (0-14 pH units) — See addendum.
PLC Programmable Logic Controller
PPM Parts Per Million — common units of measure for TDS.
PPT Parts Per Thousand — common units of measure for TDS.
Reduce As in ORP.
SCADA Supervisory Control And Data Acquisition
Tempco (TC) Temperature Compensation — See Addendum, Temperature Compensation.
TDS Total Dissolved Solids or the Total Conductive Ions in a solution — normally displayed as ppm or ppt. See
Addendum, Conductivity Conversion to TDS.
Tweaker A screwdriver specially designed for adjusting electrical calibration controls.
µM or µS Micromho or microsiemen — common unit of measure for conductivity.
Meg or Ωohm Megohm — common unit of measurement for resistivity.
USP25 United States Pharmaceutical regulation, revision number 25. In part, requires Conductivity/TDS, resistivity or
pH measurements be taken, recorded and/or systems controlled using equipment without temperature
compensation. Requires a separate temperature measuring device (temperature measurements may be part of
Cond/TDS, Resistivity or pH device but must not correct measurements for temperature errors).